I got some new filament and I am tuning the flow values. I am having trouble with jams when printing the steps calibration STL.

The print goes fine until it gets to the first top layer of the object. I have the top layer speed set to 15mm/s. Once it completes this top layer and then begins the next layer it acts as if it is jammed. What would cause this? Is the flow rate too slow and the filament expanding in the hotend too much?